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z in (-oo:+oo)
(8*(6-z))/7 = z // - z
(8*(6-z))/7-z = 0
(8*(6-z))/7+(7*(-z))/7 = 0
8*(6-z)+7*(-z) = 0
48-15*z = 0
(48-15*z)/7 = 0
(48-15*z)/7 = 0 // * 7
48-15*z = 0
48-15*z = 0 // - 48
-15*z = -48 // : -15
z = -48/(-15)
z = 16/5
z = 16/5
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